[Complete hormonal and metabolic response after iodine-131 metaiodobenzylguanidine treatment in a patient diagnosed of malignant pheochromocytoma]. / Respuesta hormonal y metabólica completa tras el tratamiento con yodo-131 metayodobencilguanidina en un caso de feocromocitoma maligno.

Radiolabeled metaiodobenzylguanidine is an analogue of norepinephrine used to localize tumors that express the neurohormone transporters, specifically those derived from the neural crest having a neuroendocrine origin. It is also used to treat non-surgical metastases derived from them. A review of the literature revealed symptomatic improvements associated to a decrease in hormone levels in a significant percentage of patients after (131)I-MIBG treatment. However, complete tumor remission has been described only in very few cases and hardly ever when bone metastases exist. We present a case of a patient diagnosed of malignant pheochromocytoma who achieved complete hormonal and metabolic response after (131)I-MIBG treatment (600 mCi) in spite of the presence of bone metastases.

[Iodine uptake in the chest in the follow-up of well-differentiated thyroid cancer]. / Captación torácica de (131)I en el seguimiento del cáncer diferenciado de tiroides.

Differentiated thyroid cancer is a disease having a very good prognosis when treated adequately. Ablation treatment with (131)I is frequently adjunct to surgery in these patients since it improves survival. Radioiodine whole-body scan is one of the imaging modality of choice in the follow-up of patients with this kind of pathology. After ablation treatment of the thyroid gland, any radioiodine accumulation in a non-physiological location usually means the presence of functioning metastasis. Recognition of potential false-positives is essential to avoid unnecessary exposure to further radiation from repeated therapeutic doses of radioactive iodine. We report a case of uptake in the chest due to bronchiectasis, potentially masquerading as pulmonary metastasis.

[Left distal femoral diaphysis-metaphyseal injury in a 13-year-old patient]. / Lesión diafiso-metafisaria distal femoral izquierda en paciente de 13 años.

This paper aims to present the usefulness of the different diagnosis imaging methods (anatomical and functional) in the characterization of bone injury. Any data, however insignificant, is justified and should be specified. In this case, the discrepancy between the vascular and pool phases in the bone scintigraphy with 99mTc-MDP reveals revealed a lesion with an intense reaction secondary to the "foreign body effect", which is not necessarily malignant.